OS map for Dartmoor 365 Grid E19 with location of site SX771878

Note: a bit of a querk but it is possible to get grid references which are within the national park but not within the area covered by the book. For example SX794799 returns J21 which, if you like, is a "bonus" square not in the book. OS grid references from outside the Dartmoor National Park will also return 365 grid references not in the book.